exam Maths Puzzle Numerical Ability

Ron can paint a room in 6 hours working alone. If his son, Jason, helps him, the job takes 4 hours. How long would it take Jason to do the job alone?

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need help solving this equation

-12-7=y/3
I have to solxe this problem for x (if there is an inequality express it in interval notation: x-5<2orx-5>2. Please help me.